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<H1 class="no-header">curs_overlay 3x</H1>
<PRE>
<STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>                                              <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>




</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
       <STRONG>overlay</STRONG>, <STRONG>overwrite</STRONG>, <STRONG>copywin</STRONG> - overlay and manipulate overlapped <STRONG>curses</STRONG>
       windows


</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>

       <STRONG>int</STRONG> <STRONG>overlay(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>);</STRONG>
       <STRONG>int</STRONG> <STRONG>overwrite(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>);</STRONG>
       <STRONG>int</STRONG> <STRONG>copywin(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>srcwin</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>dstwin</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>sminrow</EM><STRONG>,</STRONG>
             <STRONG>int</STRONG> <EM>smincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dmincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>dmaxrow</EM><STRONG>,</STRONG>
             <STRONG>int</STRONG> <EM>dmaxcol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>overlay</EM><STRONG>);</STRONG>


</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>

</PRE><H3><a name="h3-overlay_-overwrite">overlay, overwrite</a></H3><PRE>
       The <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> routines overlay <EM>srcwin</EM>  on  top  of  <EM>dstwin</EM>.
       <EM>scrwin</EM> and <EM>dstwin</EM> are not required to be the same size; only text where
       the two windows overlap is copied.  The difference is that  <STRONG>overlay</STRONG>  is
       non-destructive  (blanks  are not copied) whereas <STRONG>overwrite</STRONG> is destruc-
       tive.


</PRE><H3><a name="h3-copywin">copywin</a></H3><PRE>
       The <STRONG>copywin</STRONG> routine provides a finer granularity of  control  over  the
       <STRONG>overlay</STRONG>  and <STRONG>overwrite</STRONG> routines.  As in the <STRONG>prefresh</STRONG> routine, a rectan-
       gle is specified in the  destination  window,  (<EM>dminrow</EM>,  <EM>dmincol</EM>)  and
       (<EM>dmaxrow</EM>, <EM>dmaxcol</EM>), and the upper-left-corner coordinates of the source
       window, (<EM>sminrow</EM>, <EM>smincol</EM>).  If the  argument  <EM>overlay</EM>  is  <STRONG>true</STRONG>,  then
       copying is non-destructive, as in <STRONG>overlay</STRONG>.


</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
       Routines  that  return an integer return <STRONG>ERR</STRONG> upon failure, and <STRONG>OK</STRONG> (SVr4
       only specifies "an integer value other than <STRONG>ERR</STRONG>") upon successful  com-
       pletion.

       X/Open  defines  no error conditions.  In this implementation, <STRONG>copywin</STRONG>,
       <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> return an error if either of the window  pointers
       are null, or if some part of the window would be placed off-screen.


</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
       Note that <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> may be macros.


</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
       The  XSI Curses standard, Issue 4 describes these functions (adding the
       const qualifiers).  It further specifies their behavior in the presence
       of  characters with multibyte renditions (not yet supported in this im-
       plementation).


</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>



                                                              <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#h3-overlay_-overwrite">overlay, overwrite</a></li>
<li><a href="#h3-copywin">copywin</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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